One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,7,8)(9,10)(11,15)(12,16)(13,14)(17,23)(18,21)(19,24)(20,22)(25,26)(27,30)(28,31)(29,33)(32,36)(34,38)(35,37)(39,40)(1,2,3,4)(10,14)(15,21)(16,22)(23,24)(25,27)(26,30)(28,35)(29,34)(31,37)(32,39)(33,38)(36,40)(2,4)(9,11,13,18)(10,15,14,21)(12,19,20,17)(16,24,22,23)(26,31)(28,36)(30,37)(32,33)(35,40)(38,39)(9,12,13,20)(10,16,14,22)(11,17,18,19)(15,23,21,24)(27,34)(30,38)(35,40)(37,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.